Stored XSS via relationship-name template injection
Published May 8, 2023 · Updated Feb 3, 2025
Stored XSS in Monica 4.0.0 allows remote authenticated users to run JavaScript in another user's browser through relationship names. The people:id/relationships endpoint stores first_name and last_name values that the client-side template engine interprets without validating template expressions. Exploitation requires an account and a victim to view the stored data; the resulting script can reuse the victim's session token to change an email address or delete the account.
Summary
What happened
Stored XSS in Monica 4.0.0 allows remote authenticated users to run JavaScript in another user's browser through relationship names. The people:id/relationships endpoint stores first_name and last_name values that the client-side template engine interprets without validating template expressions. Exploitation requires an account and a victim to view the stored data; the resulting script can reuse the victim's session token to change an email address or delete the account.
The record
- CVE
- CVE-2023-30790
- Published
- May 8, 2023
- Updated
- Feb 3, 2025
- Vendor
- Butterfly Effect Pte. Ltd.
- Product
- Monica
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 8, 2023CVE publishedPublication date reported by the CVE source.
- Feb 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Fluid Attacks MonicaHQ CSTI demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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